Green light has a wavelength of 5.4 × 10^-7 m. What is the frequency of this EM-wave in air?
a. 5.55 × 10^14 Hz
b. 6.00 × 10^11 Hz
c. 9.00 × 10^8 Hz
d. 3.00 × 10^10 MHz
e. 1.80 × 10^15 Hz
A
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Suppose that the Hubble constant had the value 35.0 km/s per million light-years
(1 y = 3.156 × 107 s, mH ? mproton = 1.67 × 10-27 kg, c = 3.00 × 108 m/s, 1 light-year = 9.461 × 1015 m, G = 6.67 × 10-11 N ? m2/kg2) (a) What would be the maximum density the universe could have that would still allow it to expand forever? (b) Under the conditions of part (a), how many hydrogen atoms would we expect to find, on the average, in a volume of space measuring 3.00 m by 8.00 m by 8.00 m?
_________hardening is the least expensive process for strengthening metals, because no expensive alloy elements are added, and it is only necessary to deform the metal with standard deformation processes.
Fill in the blank(s) with the appropriate word(s).
The weight of an object equals its mass times the acceleration of gravity
a. True b. False Indicate whether the statement is true or false
Explain why the lines of force never cross one another. (Hint: Consider the direction of a magnetic line of force.)